21180978

素因数分解:

$2^1\times 3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{193}}^1$

素因数の和:288

約数の個数: 96

約数和(自身を含む): 57622656

約数和(自身を除く): 36441678

約数列:

[1, 2, 3, 6, 7, 9, 13, 14, 18, 21, 26, 39, 42, 63, 67, 78, 91, 117, 126, 134, 182, 193, 201, 234, 273, 386, 402, 469, 546, 579, 603, 819, 871, 938, 1158, 1206, 1351, 1407, 1638, 1737, 1742, 2509, 2613, 2702, 2814, 3474, 4053, 4221, 5018, 5226, 6097, 7527, 7839, 8106, 8442, 12159, 12194, 12931, 15054, 15678, 17563, 18291, 22581, 24318, 25862, 35126, 36582, 38793, 45162, 52689, 54873, 77586, 90517, 105378, 109746, 116379, 158067, 168103, 181034, 232758, 271551, 316134, 336206, 504309, 543102, 814653, 1008618, 1176721, 1512927, 1629306, 2353442, 3025854, 3530163, 7060326, 10590489, 21180978]

約数ペア:

[(1, 21180978), (2, 10590489), (3, 7060326), (6, 3530163), (7, 3025854), (9, 2353442), (13, 1629306), (14, 1512927), (18, 1176721), (21, 1008618), (26, 814653), (39, 543102), (42, 504309), (63, 336206), (67, 316134), (78, 271551), (91, 232758), (117, 181034), (126, 168103), (134, 158067), (182, 116379), (193, 109746), (201, 105378), (234, 90517), (273, 77586), (386, 54873), (402, 52689), (469, 45162), (546, 38793), (579, 36582), (603, 35126), (819, 25862), (871, 24318), (938, 22581), (1158, 18291), (1206, 17563), (1351, 15678), (1407, 15054), (1638, 12931), (1737, 12194), (1742, 12159), (2509, 8442), (2613, 8106), (2702, 7839), (2814, 7527), (3474, 6097), (4053, 5226), (4221, 5018)]